# Class `pl.Map`

A Map class.

    > Map = require 'pl.Map'
    > m = Map{one=1,two=2}
    > m:update {three=3,four=4,two=20}
    > = m == M{one=1,two=20,three=3,four=4}
    true

Dependencies: pl.utils, pl.class, pl.tablex, pl.pretty

## Fields

pl.map.keys | list of keys.
pl.map.values | list of values.

## Methods

pl.map:iter () | return an iterator over all key-value pairs.
pl.map:items () | return a List of all key-value pairs, sorted by the keys.
pl.map:setdefault (key, default) | set a value in the map if it doesn't exist yet.
pl.map:len () | size of map.
pl.map:set (key, val) | put a value into the map.
pl.map:get (key) | get a value from the map.
pl.map:getvalues (keys) | get a list of values indexed by a list of keys.
pl.map:update (table) | update the map using key/value pairs from another table.

## Metamethods

pl.map:__eq (m) | equality between maps.
pl.map:__tostring () | string representation of a map.

## Fields

pl.map.keys
  list of keys.
pl.map.values
  list of values.

## Methods

pl.map:iter ()
  return an iterator over all key-value pairs.
pl.map:items ()
  return a List of all key-value pairs, sorted by the keys.
pl.map:setdefault (key, default)
  set a value in the map if it doesn't exist yet.

  ### Parameters:

  - key the key
  - default value to set

  ### Returns:

  the value stored in the map (existing value, or the new value)
pl.map:len ()
  size of map. note: this is a relatively expensive operation!
pl.map:set (key, val)
  put a value into the map. This will remove the key if the value is `nil`

  ### Parameters:

  - key the key
  - val the value
pl.map:get (key)
  get a value from the map.

  ### Parameters:

  - key the key

  ### Returns:

  the value, or nil if not found.
pl.map:getvalues (keys)
  get a list of values indexed by a list of keys.

  ### Parameters:

  - keys a list-like table of keys

  ### Returns:

  a new list
pl.map:update (table)
  update the map using key/value pairs from another table.

  ### Parameters:

  - table table

## Metamethods

pl.map:__eq (m)
  equality between maps.

  ### Parameters:

  - m Map another map.
pl.map:__tostring ()
  string representation of a map.

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